Bass is very much important but equally so is detail, I listen to a wide range of music so I need the headphones to be great in all areas.

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This is the hard thing to achieve with the the middle price earphones - The triple drivers are where you find the real balance between strong bottom end and a detailed top end. The lower end Shure models are pretty balanced but they are dynamic drivers and are not quite as detailed as the balanced armature Phonak. I prefer brighter spacious sounds so the Phonak is my choice, stereo imaging is particularly good. The Shure feel a little slower and the stereo feels tighter but this gives them a more solid closer feel that bass fans may enjoy more.

A bass port is like the hole in a sub woofer, porting normally means putting a hole in it to release pressure, the sonic result is usually a more aggressive and clear bass note - a punchier sound. I have had a good look at these and could not see a port or hole, it might refer to the driver which could be ported inside? It is a specific design feature to aid in bass reproduction anyway